Lewis & Towers Flask Poison Bottles

I have only found four 2oz variations in the Lewis & Towers Flask poison bottles so far:

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I have only found three 2oz colour variations and 1 embossing variation in the Lewis & Towers Flask poison bottles so far.  There is 1 other known mould variant with an off centre wording.

It has a Patent no. of 590540 dated 6th October 1911.

The bottles from left to right above are as follows:

1)  Variation:  Common cobalt blue version, ground glass lip, cork

     On Front:  POISONOUS / NOT TO BE TAKEN

     On Back:  RD. NO. 590540

     On Bottom:  2oz

2)  Variation:  Extremely rare mid blue version, ground glass lip, cork

     On Front:  POISONOUS / NOT TO BE TAKEN

     On Back:  RD. NO. 590540

     On Bottom:  2

3)  Variation:  Rare aqua version, ground glass lip, cork

     On Front:  POISONOUS / NOT TO BE TAKEN

     On Back:  RD. NO. 590540

     On Bottom:  2oz

4)  Variation:  Cobalt blue version, ground glass lip, cork

     On Front:  POISONOUS / NOT TO BE TAKEN

     On Back:  RD. NO. 590540 also with rare sunburst 'I' embossing (see picture 2).

     On Bottom:  2oz